Not all Christians focus on salvation, I'd say this is mostly a Christian-Evangelical issue, so to speak (I used to be a Christian Orthodox).

While that is a theology you may have, others will reference the parable of the vine or 1 Corinthians 12:12-28, in support of theology such as the communion of saints. If there is an irreducible seed of individualism, so too might there be an irreducible seed of community.

Salvation is not individual business, but personal responsibility.